I have seen plenty of people refer to Fairies, and specially Sylveon to as "Dragon Slayer" in conversations, videos, pictures and more, but the Fairy Type was introduced in Generation 6, in Pokémon X Y. While the Fairy type deals "Super-effective" damage to dragons, ever since Generation 1 when Pokémon was first made, Dragons were weak to Ice Types and even themselves.
Not only that, but the "Glaceon" Eeeveelution was introduced in Generation 4, with Pokémon Diamond, Pearl and later Platinum, where Glaceon was an ice type.
What are your thoughts on this?